Burp 2.x: Create authenticated crawl from extension

Hi Portswigger Support! I'm interested in using an extension (in headless mode) to spawn an authenticated crawl while using the 2.x versions of Burp Suite Professional. In the 1.x versions, I would have done this by saving credentials to the project options, loading the options on startup, and then calling sendToSpider() [https://portswigger.net/burp/extender/api/burp/IBurpExtenderCallbacks.html#sendToSpider(java.net.URL)], but this doesn't seem to work with the new fancy tasks that live in the Dashboard tab. Is there a new function I could call to create a crawl task and specify credentials? Alternatively, is it possible to save such a task to the project options, and then begin executing it from an extension? Thanks, Alex